[PATCH v4 1/2] dt-bindings: display: bridge: tc358867: Document default DP preemphasis

[Rob Herring (Arm)]

On Mon, 08 Jul 2024 17:01:13 +0200, Marek Vasut wrote:
> Document default DP port preemphasis configurable via new DT property
> "toshiba,pre-emphasis". This is useful in case the DP link properties
> are known and starting link training from preemphasis setting of 0 dB
> is not useful. The preemphasis can be set separately for both DP lanes
> in range 0=0dB, 1=3.5dB, 2=6dB .
> 
> This is an endpoint property, not a port property, because the TC9595
> datasheet does mention that the DP might operate in some sort of split
> mode, where each DP lane is used to feed one display, so in that case
> there might be two endpoints.
> 
> Signed-off-by: Marek Vasut <marex at denx.de>
> ---
> Cc: Alexander Stein <alexander.stein at ew.tq-group.com>
> Cc: Andrzej Hajda <andrzej.hajda at intel.com>
> Cc: Conor Dooley <conor+dt at kernel.org>
> Cc: Daniel Vetter <daniel at ffwll.ch>
> Cc: David Airlie <airlied at gmail.com>
> Cc: Jernej Skrabec <jernej.skrabec at gmail.com>
> Cc: Jonas Karlman <jonas at kwiboo.se>
> Cc: Krzysztof Kozlowski <krzk+dt at kernel.org>
> Cc: Laurent Pinchart <Laurent.pinchart at ideasonboard.com>
> Cc: Lucas Stach <l.stach at pengutronix.de>
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Maxime Ripard <mripard at kernel.org>
> Cc: Neil Armstrong <neil.armstrong at linaro.org>
> Cc: Rob Herring <robh at kernel.org>
> Cc: Robert Foss <rfoss at kernel.org>
> Cc: Thomas Zimmermann <tzimmermann at suse.de>
> Cc: devicetree at vger.kernel.org
> Cc: dri-devel at lists.freedesktop.org
> Cc: kernel at dh-electronics.com
> ---
> V2: - Fix the type to u8 array
>     - Fix the enum items to match what they represent
> V3: - Update commit message, expand on this being an endpoint property
> V4: - Fix ref: /schemas/graph.yaml#/$defs/port-base and add unevaluatedProperties
> ---
>  .../display/bridge/toshiba,tc358767.yaml      | 21 ++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring (Arm) <robh at kernel.org>